Is 1970 GTO Cowl Section Same As 1969? - Pontiac GTO Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 05-29-2013, 12:59 PM Thread Starter
 
Join Date: Sep 2012
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Is 1970 GTO Cowl Section Same As 1969?

I had to replace the entire front cowl/firewall/hinge pillar section of my 1969 GTO convertible due to severe rot. I got a replacement section from a 1970 Lemans coupe, and welded my convertible windshield frame onto it. I'm mocking the car up and I can't get my repro front fenders to line up with the door. The top-rear fender bracket rests against the hinge pillar and places the fender about 1/2" out past the door. I need to be able to bring the fender in much more to line it up with the door.

My question is, is my 1970 replacement front section dimensionally different from the original section on my 1969 GTO? I can't determine if the bracket on the fender needs to be modified, or if it is not fitting correctly because the 1970 front section is different from the original 1969. These fenders are the ones advertised as "New" stampings and are supposed to be like NOS. That's why I'm hesitant to assume the fender bracket is the problem. Any ideas as to what the problem is would be greatly appreciated.

Thanks!
451stroker is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old 05-30-2013, 05:52 PM
 
PontiacJim's Avatar
 
Join Date: Dec 2012
Location: Gastonia, NC - Born & raised in Connecticut - 31 years
Posts: 3,565
Mentioned: 1 Post(s)
Tagged: 1 Thread(s)
Quoted: 368 Post(s)
Garage
Hate to be the bearer of bad news. Looks like they are different. Looking through several of my books here is what I find. Looking at a side view of each year model from an auto crash repair manual, the '69 windshield posts lay back more than the '70. From another book here are factory listed dimensions that show differences. '69 - track F/R 60.0" on both, '70 Front 61.0" Rear 60.0". The '70 is slightly wider at the front end width. '69 body width is 74.8", '70 body width is 76.7". The '70 body is almost 2 inches wider. Am not sure how this is measured as the body panels of the '70 have the "eyebrows" on the fenders. The concern here in my opinion is the windshield posts/slant and getting this correct -which you may have already taken into account. It is possible that the cowl section is indeed a bit to wide. I am also looking at my Original Parts Group catalog and they list the replacement lower windshield cowl as separate for '68-'69 and '70-'72. Can you measure this? You may have to make adjustments. If I were doing it, my main concern would be matching the lines of the door and hood. Does the door bolt on and fit? if not, you may have to do some reassembly. Fit the door to the quarter and rocker panel and make sure your door closes tight and is not gapped open at the front - a sure sign the cowl section is too wide.
If this fits OK, look to see if your hinge bolt holes match. If so, bolt it up secure. If not, you will have to do some adjusting/fabricating -may be as simple as changing hinges as I do not know if '69/'70 are same or different. Get the door in place, then basically you want to reassemble enough of the front end (probably the radiator/fender support) so you can hang the fenders. You want to match the gap/lines of the fender to the door. You also want to get your hood on to match the gap/lines of the top edge of the fender with the lines/edges of your hood. Adjust brackets as needed, but tack in place and don't make them permanent at this time. With both fenders in temporarily in place, I would then either measure the front section width of your fenders against the front section width of your nose piece, or have a buddy help hold it into place. if this look OK, then you could go back and make your brackets permanent by welding them solid. This is how I think I would do it and understand I am simply going over this in my head, so actual fit technique might change considerably once I got into it -never had to do this operation before. The correct gaps between doors/fenders/hood are the deciding factor to be used in aligning everything up and fitting it correctly, even if it is not as factory and you are trying to make it work. When squaring up fenders at the top where the hood goes, get dimensions side to side (the width needed for the hood) and do a diagonal measurement, front left edge of fender where the hood corner would be to right rear edge of fender where the hood corner would be. Repeat process for other side and your measurements should be the same. If not, it is not square even if your side to side (width measurements) are seemingly the same. Measure twice, cut once. Hope this is of some kind of help to you, but don't get discouraged as the joy of working on an old car is knowing how to fabricate. Again, just my silly thoughts on things.
PontiacJim is offline  
post #3 of 3 (permalink) Old 06-04-2013, 07:09 PM Thread Starter
 
Join Date: Sep 2012
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I really appreciate all the info! I have the front cowl section mounted on the frame and welded to temporary supports connected to the inner quarter panel section. I was able to get very good alignment on both doors to the quarters and rockers. The repro front fenders are what threw me off. I should've kept my one useable original front fender for mock-up. But, I've come to the conclusion that the reproduction fenders are pretty far off as far as accuracy. I believe the fenders are my problem. I modified the one inner bracket (the one that bolts to the hinge pillar) on the driver's fender and got the fender to fit much better. It looks like I'll have to do a lot of tweaking to the front fenders. The fender contour matches the door contour poorly. There is a hard body line where the side of the fender transitions to the top of the fender. I don't have this line in either of my doors, so it just convinces me more that the fenders are repro crap and will need a lot of messaging to make this whole thing work.

I made wooden templates before I cut the windshield frame off of my original piece. I think I'm in the ballpark, but I'll have to wait for window mockup to know whether or not I have to adjust the position of the windshield frame. The guy who sold me this car screwed me so bad. It really belonged in a junk yard 30 years ago. I guess that's the risk of buying sight unseen.

Thanks again!
451stroker is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
1970 Cowl And Firewall On A 1969? 451stroker 1964-1974 Tempest, LeMans & GTO Projects, Barn Finds & Restoration Discussions 1 10-18-2012 02:12 PM
1971 GTO cowl tag question????? samanatoo 1964-1974 Tempest, LeMans & GTO Data Plate, Vin Tag and Drive Train Numbers 1 10-01-2008 09:01 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome